Rock drill



Apr. 24, 1923. v 1,452,734 V G. GRIESCHE ROCK DRILL Filed Aug. 23, 1921 w k w N INVE/V TOR $1 Q 6057/) v muse/v5 ATTY.

Patented Apr. 24, 1923.

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ROCK DRILL.

Application filed August 23, 1921. Serial No. 494,661.

To all 10 from it may concern Be'it known that I. GUSTAV GRIEsoHE,

a citizen of the United States, residing at Berkeley, in the county of Alameda and State of California, have invented new and useful Improvements in Rock Drills; of

which the following is a specification.

This invention relates to well boring tools, and particularly pertains to a rotary drill bit It is the principal object of the resent invention to 'provide arotary drill bit especially adapted for use in boring wellstwhich bit is designed to utilize abrasive material, by which thecutting action is produced, said tool being simplein construction an continuous in its operation. 7

The present invention contemplates the use of a drill bit substantially cylindrical in. shape, and, having passageways longitudinally and interiorly thereof, which passageways communicate with outlet open.- ings' in the lower fiat end of the tool through which abr'asive'material may be fOIC6(l.'

The invention is illustrated by way of example in the accompanying drawings in which: I

Figure 1 is a view in vertical section and elevation through one form of the drill bit n withwhich the present invention is concerned, further showing its mounting.

Fig. 2 is a view in end elevation showing the cutting face of the bit disclosed in r Fig. 3 is a view in end elevation showing another form of the cutting face. I Fig. 4; is a view in longitudinal section through a modified form of the bit in which a single outlet opening is'provided in'the cutting face. Q

Fig. 5 is a view in end elevation showing invention shown in Fig. 1 a pair of helical grooves 14 are formed within the body of the drill bit and radiate from the central passageway 13. The lower ends of the grooves will terminate at the cutting face 15 of the tool and will be disposeddiametrically oppositeeach. other as more clearly shown lnFig. 2. Thesegrooves and the central passageway 13are provided to receive water or other liquid and abrasive material, such as gritty, granular substance which ,would operate betweenthe cutting face of the tool and the material being drilled to gradually erode the material. It will be understood that the liquid and abraslve material will be forced downwardly through the tool under the pressure established by the head of liquid and material in the drill stem 10.

In order to prevent violent action at the lower end of the drill stem a plurality of radially extending'openings 16 are. formed at intervals along the length of the drill stem. said openings permitting a portion of the liquid to by-pass from the tool without being forced from the lower end thereof. This will form a counter-pressure around the tool and at the same time will relieve the pressure which would normally be ex erted against the bottom ofi the bore at the cutting face of the tool.

It will be understood that the outlet openings 17 which will occur on the flat cutting face mightbe of various designs, as. for example, the design shown in Fig. 3, in which instance a slight clearance will occur at the bacltof the openings.

Reference being had to Figs.

4 and Spit will be seen that a cutting tool isfprovided which is practically identical with the one previously described, although in this in stance but one helical passageway is formed. This passageway communicates with the central opening 13 and of course only provides -a single outlet opening 17 in the cutting face of the tool.

In Figs. 6 and 7 another form of the invention is disclosed which differs principally from the forms previously described in that the lower end of the passageway 13 isclosed I by a frusto-conical member 18 and furthermore in that a plurality of outlet openings 19 extend through the wall of the tool to establish communication with the central bore. 7

In operation of the present invention a boring tool is first provided, constructed along the general lines, as shown by way of example in the accompanying drawings,

, tion of this material will be forced from the outlet openings 17 in the fiat cutting face of the tool. .Attention is directed to the fact that the cutting face 15 is disposed at right angles to the longitudinal axis of the tool and that it represents a flat. surface, substantially equal to the diameter of the tool body. As the tool. rotates the abrasive material will act between the cutting face and the lower end of the bore to gradually erode the material, forcing it up along the sides of the tool and causing it to form a part'of the wall ofthe bore. At the same time a flow of liquid will be brought about through the openings 16. This flow will to a. certain extent-relieve the pressure of the liquid and prevent an excessive disturbance at the lower end of the drill bit, and as the major portion of the liquid will pass out through openings 16 this liquid will actto clear the bore and assist in plastering the wallsthereof.

It will .thus be seen that the device here disclosed is decidedly simple in construction,

that it will be self-sharpening, and will act to rigidly and continuously perform its in bottom.

I claim and desire to secure by Letters Patent is: y

1. A boring tool comprising a substantially cylindrical bit, a longitudinal bore therethrough, and a plurality of internal helical threads within the bit, communicating with the cutting face thereof and radiating from the longitudinalbore of the bit.

2. A- rotating rock drill with internal threads within the body of the rock drill to deliver abrasive material to the bottom of the well.

3. A rotating rock drill with one or more internal threads radiating from the center.

4. Arotating rock drill having a longitudinal'opening formed therethrough fromwhich one or more threads radiate to dis tribute abrasive material between the drill and well bottom, said drill havlng a flat cutting face.

5. A rotating rock drill with one or more internal threads radiating from the center of drill, having one or more openings on the sides of drill to deliver the main supply of water near the top of drill to discharge the cuttings but, not abrasive material, and the lower openings only large enough to supply water to the bottom of drill but not large enoughto wash out the abrasive material from thebottom of well.

6. A boring tool havingafiat cutting face with one or more openings occurring therein and internal helical threads formed within the tool to communicate with said openings andthrough which abrasive material may be fed.

7. A rotating rock drill having a longitudinal opening formed therethrough from which radiates one or more threads, said drill having a flatcutting surface with openings in communication with said threads whereby abrasive material may be distributed between the cutting face and the bottom of the well.

S. A rotating rock drill having a longitudinal opening formed therethrough from which radiates one or more internal threads, said drill having a flat cutting face to the area of the cross section of the drill, said face having openings in communication with said threads whereby abrasive material may be fed between the cutting face andvthe well susrav GRIE$CHE lea 

